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| year | consumption | change |
| 1980 | 5.90 | NA |
| 1981 | 6.70 | 13.56 % |
| 1982 | 7.70 | 14.93 % |
| 1983 | 8.20 | 6.49 % |
| 1984 | 9.00 | 9.76 % |
| 1985 | 9.70 | 7.78 % |
| 1986 | 10.00 | 3.09 % |
| 1987 | 11.00 | 10.00 % |
| 1988 | 12.00 | 9.09 % |
| 1989 | 12.00 | 0.00 % |
| 1990 | 13.00 | 8.33 % |
| 1991 | 13.00 | 0.00 % |
| 1992 | 14.00 | 7.69 % |
| 1993 | 14.00 | 0.00 % |
| 1994 | 14.00 | 0.00 % |
| 1995 | 14.00 | 0.00 % |
| 1996 | 15.00 | 7.14 % |
| 1997 | 15.00 | 0.00 % |
| 1998 | 17.00 | 13.33 % |
| 1999 | 18.00 | 5.88 % |
| 2000 | 20.00 | 11.11 % |
| 2001 | 21.00 | 5.00 % |
| 2002 | 22.00 | 4.76 % |
| 2003 | 24.00 | 9.09 % |
| 2004 | 24.00 | 0.00 % |
| 2005 | 28.00 | 16.67 % |
| 2006 | 27.00 | -3.57 % |
| 2007 | 28.00 | 3.70 % |
| 2008 | 30.00 | 7.14 % |
| 2009 | 28.00 | -6.67 % |
| 2010 | 34.00 | 21.43 % |
| 2011 | 38.00 | 11.76 % |
| 2012 | 43.00 | 13.16 % |
| 2013 | 45.00 | 4.65 % |
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